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I'll tell you a couple things...there's no way on earth that you can change a .psd file into a flattened, compressed image and expect to convert it back into a .psd file when you;re done with it...(unless you're actually working inside Photoshop....and even then, you lose the layers)

Same with converting a .swf to a flat image and back....impossible

basically whatever you are doing isn;t practical....I suggest you do your file manipulation with the working Flash/Photoshop files BEFORE you upload them...

google for ` imagemagick `, not sure about swf's (though there are other applications out there for those I am sure) but imagemacgick will convert tiff's and psd's to whatever you want, many *nix hosts have imagemagick installed and you can use it via php's exec function..

Well I would use imagemagick if it is installed, its far simpler (and less code) to use than say GD functions for simple operations (and can do some quite funky stuff as well) , but if you are writing re-distributable code then you have to consider that not all hosts will have it installed (though most *nix hosts will) especially windows based hosts (though imagemagick works fine on win32 as well).